UTILIZATION OF PHOSPHORUS FROM VARIOUS FERTILIZER MATERIALS

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Abstract
A mixture of orchard grass and ladino clover was seeded on plots treated with 4 sources of radioactive phosphate fertilizers: superphosphate, Ca metaphos-phate, di- and tricalcium phosphate. The fertilizers were broadcast and drilled at 50 and 100 lbs. of P2O5 per acre. The yields and P2O5 content of ladino clover and orchard grass were not associated with source of phosphate or rate of appln. The avg. yield of ladino clover for the 1st harvest was higher for the drilled than for the broadcast appln. The amt. of P uptake by ladino clover was higher for superphosphate at the 3 sampling periods than for the other fertilizers. During the early season more fertilizer was obtained from Ca metaphosphate than from di- or tricalcium phosphate. With superphosphate and Ca metaphosphate more fertilizer P was absorbed from the drilled than from the broadcast applns. Ladino clover absorbed more than 20% of its P from the fertilizer at all 3 sampling periods. This value for orchard grass decreased rapidly during the growing season. A larger % of P from the fertilizer was absorbed by ladino clover from drilled applns. than from broadcast. The reverse occurred with orchard grass.
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